Is Interior Or Exterior Basement Waterproofing More Cost-Effective?

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Is Interior Or Exterior Basement Waterproofing More Cost-Effective?

7 February 2023
 Categories: , Blog

Waterproofing is often the best option to help resolve flooding or moisture intrusion issues in an existing basement. However, waterproofing a basement is a complex process, and numerous products and techniques exist to solve this problem. Determining which is best for your needs can often be challenging.

Most waterproofing solutions generally fall into two categories: interior and exterior. There's no question that exterior solutions are often more expensive than interior ones, but does that mean they're less cost-effective over the long run? The answer can be more complex than you might expect.

What's the Difference Between Interior and Exterior Waterproofing?

While it's easy to broadly categorize waterproofing methods, there are numerous options for interior and exterior waterproofing. In general, exterior methods include installing membranes over your existing foundation or building a drainage system (commonly known as a french drain) around the exterior of your home.

Interior methods are surprisingly similar and approach the problem from the other side. For example, sump pumps serve a similar role to french drains, but they collect the water inside your basement instead of routing it away from the outside. Likewise, vapor barriers and waterproof sealant coatings serve a similar role to exterior membranes.

Exterior waterproofing methods are typically more expensive because they require excavation work. While installing a french drain will usually only require a relatively shallow trench, installing a waterproof membrane will often require substantial excavation around your foundation's base. The labor costs associated with excavation can make these projects expensive.

Which Option Is More Cost-Effective?

As with many home improvement projects, there are often many tradeoffs when choosing a waterproofing method for your basement. For example, it's important to consider the problem you're trying to solve. Do you have a minor issue with moisture and water intrusion in your basement, or are you facing major flooding problems and the potential for severe foundation damage?

Since interior waterproofing methods are often cheaper, they are more cost-effective for relatively minor problems. For example, a simple vapor barrier may be sufficient if you're primarily worried about excess humidity and not severe flooding. On the other hand, you may need more extensive interior waterproofing for issues with standing water.

Still, exterior waterproofing methods may be more cost-effective in cases where there are severe issues with hydrostatic pressure or grade problems. While installing a french drain or waterproof membranes (or both) may be expensive, the high price can pay off over the long run by protecting your home from severe flooding or even foundation damage. 

Contact basement waterproofing contractors in your area to learn more.